Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e5e3f90106aa850…

MALICIOUS

PDF

113.0 KB Created: 2021-03-23 23:25:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38f5744a1f93151a477169c29d507db0 SHA-1: 97af704065f9154152eef6cd94ba2a618113f2b6 SHA-256: 0e5e3f90106aa850112a7d163e5cebe15a6862f72723ff15bbba72a58bfd05de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs pointing to disposable domains and a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the URLs and the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/wix?keyword=giuciao+free+books
    • https://cdn-cms.f-static.net/uploads/4488842/normal_601258bf47ffc.pdf
    • http://resimpub.com/leduzalxpp5o.pdf
    • http://justiciaforjustice.com/first_things_first_in_a_sentence_examples5pkbs.pdf
    • http://uspex22.online/rspca_dog_walking_guideae1cz.pdf
    • http://mikazuxo.mypressonline.com/21499085359.pdf
    • https://cdn-cms.f-static.net/uploads/4470523/normal_603c53eedec84.pdf
    • http://esmoney.site/podadinu367ud.pdf
    • http://bio-ita.fun/reznor_heater_service_manualepb1t.pdf
    • https://static.s123-cdn-static.com/uploads/4480408/normal_5ff42c641adde.pdf
    • http://dombitarf.ru/think_social_psychology_2012_editionc1sp9.pdf
    • https://cdn-cms.f-static.net/uploads/4413585/normal_602ef9cad603a.pdf
    • http://fudoviwil.mywebcommunity.org/46842239195.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://belibivizonojo.myartsonline.com/tuzukawafobuvezubodibip.pdf
    • https://uploads.strikinglycdn.com/files/5c7139d9-8bba-412d-8865-9bf1e23031b6/boralekenaxapeb.pdf
    • https://uploads.strikinglycdn.com/files/8e41ec74-daf4-4fe0-b717-5d0db1d5b808/kenmore_elite_top_load_washer_instructions.pdf
    • https://uploads.strikinglycdn.com/files/e6367465-0d62-4a01-b780-43234a892626/vibiw.pdf
    • https://uploads.strikinglycdn.com/files/59a25c77-699f-4580-91ba-14892da35f50/bujagepoxef.pdf
    • http://duwemanuwixam.atwebpages.com/2016_mustang_gt350_horsepower.pdf
    • http://rupesujutiwu.myartsonline.com/tadodib.pdf
    • https://s3.amazonaws.com/latufenaw/72973751371.pdf
    • https://s3.amazonaws.com/fujadabez/53700492322.pdf
    • https://uploads.strikinglycdn.com/files/c5fd47d1-a619-4384-9b1b-930679345fff/ponniyin_selvan_english_part_2.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000181f4.bin
37435db6425a5b758684548dd31a02b45bb499aff4642f405a0381ea9d1267b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181F4 5076 bytes
font_01_sfnt_off00019355.bin
c76ab244e22f45c4ef2f5befb7a56fc937084174b434469cb2f76fcc416b7ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19355 10276 bytes

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